Santos, Postal & Company is merging in Hildebrand, Limparis & Associates, adding an office in Frederick, Md., to the firm’s existing office in Rockville, Md.

Blucora Inc., the onetime Internet giant known as InfoSpace, agreed to pay $580 million for HD Vest Financial Services, one of the few brokerages that specialize in helping tax advisers become licensed to sell investment products.

Top 10 Gulf Coast Regional Leader LaPorte CPAs announced that it will merge with Beyer, Stagni & Co., effective December 1.

Drees Riskey & Vallager has merged with Midwest Regional Leader Brady Martz, effective October 1.

A roundup of recent announcements from accounting firms and companies across the country.

Mike Lynch, the founder of U.K. software company Autonomy, accused Hewlett-Packard Co. of damaging his career with false statements in the fallout from the two companies’ $10-billion merger that has been marred by a massive writedown and allegations of accounting fraud.

Regional CPA firm Eide Bailly plans to merge in Arizona CPA firm Beckman & Kunkin on Nov. 2.

HBK CPAs & Consultants has signed a merger agreement under which Norman, Jones, Enlow & Co. of Columbus, Ohio, will join its firm.

The Securities and Exchange Commission has charged five Florida residents—including an accountant and two lawyers—with insider trading ahead of the acquisition of Pharmasset by Gilead Sciences.

Top 100 Firm Doeren Mayhew announced that it will merge with CPA firm Orth, Chakler, Murnane & Co., effective October 1.